<!DOCTYPE html>
<html lang="en">
<head>
	<meta charset="UTF-8">
	<title>多物体运动</title>
	<script type="text/javascript" src="action.js"></script>
	<style type="text/css">
		ul{
			list-style: none;
		}
		ul li{
			width: 200px;
			height: 100px;
			background: yellow;
			margin-bottom: 30px;
			opacity: 0.3;
		}
	</style>
</head>
<body>
	<ul>
		<li></li>
		<li></li>
		<li></li>
	</ul>
</body>
</html>